Tool-holding device.



F. H. K'ASPERSON.

' TOOL HOLDING DEVICE. APPLICATION FILED SEPT. I8, I.9II. RENEWED FEB. I?, I9I7| 1,240,729.

Patented Sept. 18, 1917. n

Mas

Fwamk @y 4m-917,

e@ M- O FRANK H. KASPERSON, OF NEW HAVEN', CONNECTICUT.

TOOL-HOLDNG DEVICE.

regiones.

Application filed September' 18, 1911, Serial No. 649,886.

. un Improvement in Tool-HoldingDevices,

lhands or clothes of a workman. Some urisdictions laws have been made pro- 'of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings ,representing like parts.

This invention is an improvement in tool holding and driving devices, and is adapted more particularly, although not exclusively,

Ato devices for driving wood-bits. -VVood-bts are frequently made from a ribbon of steel twisted into suitable form to provide the main boring portion of 'the bit, and have ends compressed into cylindrical Yform to provide shanks for insertion into a socket. Usually it is not Vpractical to taper these Shanks, since there is not sufficient material in the ribbon-like strip to produce a tapered shank' of large enough diameter to provide the necessary strength. The device to be described is more particularly, although not-exclusively, intended for driving ytools having cylindrical, slabbed off or other non-tapering Shanks. Heretofore such a shank has been held in its socket by a set screw having a head which projects radially outward from said socket. Such a screw has been found objectionable, since, when rotating it frequently catches and tears the 1n fact in hibiting the use of such set screws. There is further objection to this set screw, since it requires the use of a wrench to adjust the same, and its small threads quickly become Worn and ineffective.

This invention, among other objects, aims to overcome these objections.

The character of the invention inay best understood by reference to the following description of an illustrative embodiment thereof shoifviibinnthe accompanying drawing, Whereiit;r

' Figure 1 is afsiu'e elevation of a tooldriving device and tool embodying the invention; v

Fig. 2 on an enlarged scale is a longitudinal section taken on line 2 2 of Fig. l;

" Fig. 3 is a transverse section taken on line 3 3 of Fig. 2; and

Fig. 4 is a detailed View of a set key to be referred to. Y

Specification of Letters Patent.

clothes or injure the Patented Sept. 1S, 1917. `Renewed February 17, 1917. Serial No. 149,376.

Referring to the drawing, the illustrative tool holding and driving device there shown as embodying the invention comprises a driving head 1 at one end of a socket or tool receiving means 3 having a tapered end 5 adapted to be fitted tightly into a correspondingly shaped bore of a spindle of a suitable machine for driving the bit. The head l is shown herein on the end of a socket 3, but it will be understood that suchhead might constitute an integral part ofthe nose of a spindle if desired.

The socket 3 contains a cylindrical or other bore 7 adapted to receive the cylindrical or other shaped shank 9 of a tool illustrated herein as a wood-bit 11.

An important feature of the invention relates to the construction of the driving head,

whereby a positive driving engagement with the ,tool is obtained. To this end said head is provided with one or more. but preferably two pposed teeth 13, having helical-like slots 14 between them simulating the shape and direction of the twist portions 15 of the bit. Preferably the teeth 13 have rounded or blunted ends 17 to avoid the formation of any sharp points such as might catch the hands of a workman. Preferably the slots 14 are of greater width than the portions 15 of the bit.and as a result will permit more or less play of said. portions `as on their insertion and removal therefrom. When the tool shank is inserted in the bore of said tool receiving means the teeth 13 engage the tool twist portions 15 and further relative rotation between the bit and said driving head 1 will be prevented, and if a rotative movement is given to the head, such movement will be transmitted positively to the bit through its twist poi'- yical advantage.

The movement of the bit into the socket is limited by the engagement of the twist portions-15 with the endsol' the head slots 14, thus providing for the 'feeding of the tool in thi` direction of its longitudinal axis as a hole is bored.

Then the tool is driven by the head, the inclined relation of the portions 15 with the teeth 1.3 causes the tool to tend to remain with its portions 15 in engagement with the ends of said slots and also in positive engagement with the teeth 13.

After a hole lhas been bored by the bit and `the driving head has been reversed or retreated aWay from'the Work operated on to draw. the bit from the hole, the driving teeth 13 would tend to Withdraw from the-bit portions 13 and cause the head to Withdraw from said tool. An important feature of the invention relates to means for resisting such relative rotation between the-tool and head as would separate the tool driving por'- tions 15 from said teeth. To this end there is provided a set key 19 (see Figs. 2, 3 and 4) mounted in a transverse aperture in the, socket 3 and preferably directly above the head 1. This key has an inner roughened or toothed face 21 for vengagement with the tool shank 9, the direction of said teeth being such as to resist rotation of ysaid shank. relatively to nsaid socket. The 'opposite or outer face of said key is inclined to present a cam face 23 for cooperative engagement with a preferably rounded internal bevel or cam face in a sleeve 27 threaded to the socket 3 and having a portion of its periphery kiiurled to facilitate adjustment thereof. y

To prevent the key 19 from falling into the shank receiving bore 7 when the tool is removed, said key is provided with shoulders 25) (Fig. .3) adapted to seat on counter ledges 31 in the key receiving aperture. Said shoulders 29 are -set back sutiiciently from the tooth gripping face 21 of the key to prevent an)Y possibility of their interfering with the en'- gagemeiit of said face 21 with ja tool shank when in said socket.

Vlien the sleeve 27 is turned in one di rer tion, its internal bevel 25 will wipe againstv the key incline 23 and cam or press the key toward and into gripping engagement with the shank of the tool. As a result, rotation of said shank in said socket will be effectively prevented.

A very slight rotative adjustment of the sleeve 27 will be suiicient to set the key to engage or release the tool shank. It is desirable that the sleeve 27 should not be retreated from the key 19 sutiiciently to entirely uncover the same, since if it did so the vkey might drop out of its aperture and be lost. To limit the releasing movement of the sleeve 27, a stop pin 35 is set into said socket in proper position to give the desired limit to the retreat-ing movement of the sleeve 27 from said key. To prevent said pin from being exposed and liable to catch the clothes or tear the-hands of a Workman, the sleeve 27 is extended and has a counterbore 37 sufficiently, deep to always cover the pin throughout the adjustment of said sleeve.

The pin 35 may be introduced to said sbcket through a small hole 39 in said sleeve extension.

To insert a tool into driving position, it

is merely necessary to introducethe shank thereof into the socket 3 and turn the. tool slightly to bring its twist portions 15 into e is merely necessary to reversely rotate the sleeve 27 ,its bevel readily withdrawing' from the cam face 23 of the key and permitting "the tool to drop or be freely Withdrawn from its socket.

The device is not limited in its use to bits or tools having twist or main portions of greater diameter than the shank of the tool, but may be used for bits having a twistA or main portion-of a diameter equaling that of the shank or less than the latter. Such bits as these do not require the strong positive drive such as is obtained by the driving head 1 but the grip of the sleeve actuated, key on the shank of such a bit Will be suflicient to hold the samein its socket throughout its operations. V

` Vhile the device is described herein as applied to `machine tools, it Will be understood that it is not limited thereto, but may be readily applied to hand braces if desired. By this invention the necessity for a set screw is eliminated; there are no projections to catch and tear the hands or clothes of the Workman; and the key is easilyvset and released by the sleeve Without the necessity of a Wrench of any kind. The tool driving device described is extremely simple and compact, strong in construction and eective in operation. l f

Having described one embodiment of the invention Without limiting the same thereto, what I claim as new and desireto secure by Letters Patent is:

1. A. tool holding device comprising in combination, tool receiving means having a bore therein and teeth with provision for positive driving engagement with spiral portions of a tool and having provision for limiting the adjustment of the shank of the tool into said bore, and means adjustable relatively to said shank for gripping the same to prevent Withdrawal thereof from said bore. I 2. A tool holding device comprising in combination, tool receiving means having a straight bore therein, a tool having-a spiral portion and a straight shank for insertion ioo in said bore, a tooth on said tool receiving means inciuing an ajjuse-` gapping said straight peven Withdrawai ith'eieoi iom shank Salo here 8. A ioni noir device comprising in coniuiiiaion, booi ieoeiving :means having a here iiierein, a :tooi having a spinal or equivaent portion and a shank sinaiie than the latter for inse-ation inosaid bore, a tooth rigid with said nool receiving means for positive driving engagement with said s'piiai portion and having provision for limiting the adjustmenfs said shank into said bore,

and means camieci by said tool receiving` means for preventing 'Wihdrawai of said shank from sail here.,

4. A tool heid-ing device eomprising in combination, foo reeeiving means having a FRANK H. KASPERSGN.

Witnesses HENRY T.. Wim-mms, ROBERT H. KAMMLER 

